<!DOCTYPE html>
<html lang='en'>

<head>
  <meta charset='UTF-8'>
  <meta http-equiv='X-UA-Compatible' content='IE=edge'>
  <meta name='viewport' content='width=device-width, initial-scale=1.0'>
  <title>Document</title>
  <script src='https://cdn.jsdelivr.net/npm/vue/dist/vue.js'></script>
  <style>
    [v-cloak] {
      display: none;
    }
  </style>
</head>

<body>
  <div id='app'>
    <h2 v-cloak>{{message}}</h2>
  </div>
  <script>
    // 一旦vue实例被创建，v-cloak属性便消失了
    setTimeout(function() {
      const app = new Vue({
        el: '#app',
        data: {
          message: 'hello world'
        }
      })
    }, 2000)
  </script>
</body>

</html>